1 files changed, 125 insertions, 0 deletions
diff --git a/newlib/libm/mathfp/s_ldexp.c b/newlib/libm/mathfp/s_ldexp.c
new file mode 100644
index 00000000000..97d8a3ba546
--- /dev/null
+++ b/newlib/libm/mathfp/s_ldexp.c
@@ -0,0 +1,125 @@
+
+/* @(#)z_ldexp.c 1.0 98/08/13 */
+
+/*
+FUNCTION
+       <<ldexp>>, <<ldexpf>>---load exponent
+
+INDEX
+        ldexp
+INDEX
+        ldexpf
+
+ANSI_SYNOPSIS
+       #include <math.h>
+       double ldexp(double <[val]>, int <[exp]>);
+       float ldexpf(float <[val]>, int <[exp]>);
+
+TRAD_SYNOPSIS
+       #include <math.h>
+
+       double ldexp(<[val]>, <[exp]>)
+              double <[val]>;
+              int <[exp]>;
+
+       float ldexpf(<[val]>, <[exp]>)
+              float <[val]>;
+              int <[exp]>;
+
+DESCRIPTION
+<<ldexp>> calculates the value
+@ifinfo
+<[val]> times 2 to the power <[exp]>.
+@end ifinfo
+@tex
+$val\times 2^{exp}$.
+@end tex
+<<ldexpf>> is identical, save that it takes and returns <<float>>
+rather than <<double>> values.
+
+RETURNS
+<<ldexp>> returns the calculated value.
+
+Underflow and overflow both set <<errno>> to <<ERANGE>>.
+On underflow, <<ldexp>> and <<ldexpf>> return 0.0.
+On overflow, <<ldexp>> returns plus or minus <<HUGE_VAL>>.
+
+PORTABILITY
+<<ldexp>> is ANSI, <<ldexpf>> is an extension.
+
+*/
+
+/******************************************************************
+ * ldexp
+ *
+ * Input:
+ *   d - a floating point value
+ *   e - an exponent value
+ *
+ * Output:
+ *   A floating point value f such that f = d * 2 ^ e.
+ *
+ * Description:
+ *   This function creates a floating point number f such that
+ *   f = d * 2 ^ e.
+ *
+ *****************************************************************/
+
+#include <float.h>
+#include "fdlibm.h"
+#include "zmath.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+#define DOUBLE_EXP_OFFS 1023
+
+double
+_DEFUN (ldexp, (double, int),
+        double d _AND
+        int e)
+{
+  int exp;
+  __uint32_t hd;
+
+  GET_HIGH_WORD (hd, d);
+
+  /* Check for special values and then scale d by e. */
+  switch (numtest (d))
+    {
+      case NAN:
+        errno = EDOM;
+        break;
+
+      case INF:
+        errno = ERANGE;
+        break;
+
+      case 0:
+        break;
+
+      default:
+        exp = (hd & 0x7ff00000) >> 20;
+        exp += e;
+
+        if (exp > DBL_MAX_EXP + DOUBLE_EXP_OFFS)
+         {
+           errno = ERANGE;
+           d = z_infinity.d;
+         }
+        else if (exp < DBL_MIN_EXP + DOUBLE_EXP_OFFS)
+         {
+           errno = ERANGE;
+           d = -z_infinity.d;
+         }
+        else
+         {
+           hd &= 0x800fffff;
+           hd |= exp << 20;
+           SET_HIGH_WORD (d, hd);
+         }
+    }
+
+    return (d);
+}
+
+#endif /* _DOUBLE_IS_32BITS */